Reenforcing concrete structures



J. DI SIASIO.

A r v nEENFoRcING cowcmesmucuaes.

APPLICATION FIL-ED JUNE I4, 1920. L41 6,548, Patented May I6, 1922.

2 SHEETS-SHEET 1.

J. DI STASID.

REENFORCING CONCRETE STRUCTURES.

SHEET 2.

W, w M

2 SHEETS- vendan.

Patented May APPLICATION FILED JUNE 14, 1920.

JOSEPH DI STASIO, 0F NEW YORK, N. Y.

REENFORCING CONCRETE STRUCTURES.

Leraars.

Specification of Letters Patent.

Patented May ie, ieee.

Application filed June lll, 1920. Serial No. 388,959.

T 0 all whomzt may concern:

Be it lrnown that I, JOSEPH DI STAsio, a citizen of the United States,residingy at the city, county, and State of vNew York, have inventedcertain new and useful improvements in Reenforcing Concrete Structures,fully described and represented in the following speciiication and theaccompanying drawings, forming a part of the same.

This inventionrelates to an improvement in reen'forced concrete floorconstruction.

The particular object vof the invention is to provide a simple,economical and efficient means for producing a flat slabl floorconstruction composed of a series of columns arranged in rows, withadjacent columns forming bays, and bands of metal reenforcing steel meshextending from column to column in each direction, or at right angles toeach other, and with additional bands of such mesh between the columns,the latter 'bands alsorunning at right angles to each otherand extendingoverthe bays, thereby dispensing entirely with cross beams orgirders'and enabling a building to be erected ,with great rapidity andeconomy of labor 4and material, and capable of bearing greater floorstrains per given area than reenforced concrete structures now known.

For a full understanding of the invention, a detailed description of apreferred embodiment thereof will now be given in connection with theaccompanying drawings, and the novel features thereof then pointed outin the claims.

In they drawingsyFigure l is aplan view of a portion of floor with4 theconcrete and metallic mesh broken away to illustrate the arrangement ofthe reenforcing means;

lFigures 2' vand 3 are sections respectively I ony the lines 2-2 andB--Bof Figure 1, showing the 'supporting columnl heads in distance. Figure4; isa perspective view of a portion of a floor, showing the relativearrangements of the reenforcing steel mesh bands.

i Referring now to the drawings, thev numeral lindicates the ordinaryconcrete col'- umn withV the usual square head enlargement 2. Aroundeach such column head enlargement, and positioned on theJ usualtemporary support (not shown), at suitable and approximately equaldistances from such column head enlargements, aresmall concrete blocks,3, eight such blocks preferably be- 4 ing used at these points, asshown. On these proximately the same size as those formed by the chairbars surrounding the column heads. All the chair bars have their endsoverlapping on the supports 3 and are securely wired to the latter `inany suitable manner.

The structure so far described, lis now ready to receive. the first orlower bands or strips of steel. mesh 8,' such brands being of suitablelengths. vThe arrangement of these bands of steelmesh with relation tocertain chair bars over which they pass and certain additional chairbars which are positioned thereover as hereinafter described and underwhich such mesh passes, constitutes one of the important features of theinvention` the great strength and rigidity of the construction derivedby my invention depending wholly on the arrangement of such bands orstrips of steel mesh with respect to the chair bars and the position ofsuch strips relatively tothe upper or lower surface of the concrete inwhich such strips are eventually embedded, which arrangement will now bedescribed-` y' The bands of steel mesh are of slightly less width thantheV squares formed by the chair bars and their concrete block supports,and the first laid bands run from column head to column head in twodirections, or at right angles to eachy other, and are depressed or dipinto the spaces between the column heads.

Additional chair bars t andsuppor'ts Bare then positioned in thedepressed squares, and the second or superposed bands are laid thereon,the latter bands running at right angles to each other. The bays andvspaces between the columns are thereby covered with bands .of steelmesh, one of which, i. e., the rstlaid ofthe second set or superposedbands, as also the last laid bands of such set, dipping only into thespaces or bays which are central of each set of four columns.

y The first laid bands start from the wall section A and extend overthose squares which are in line with the columns, the bands or stripsofsteel mesh passing over chair bars 4 nearest the wall and parallelthereto and are bent or dipped down, from the point at which they crosssuch chair bars, at an angle of approximately 4to@ to a point near thesurface of the temporary support on which the blocks 3, 3 arepositioned, thence straight across such space and are thenbent upward,yat the same angle to the chair bars surrounding the column head, and runstraight across such column head and the chair bars arranged thereon,and so on, such squares into which the first layer of mesh dips and thecolumn heads alternating with each other. Each row of squares in linewith. the column heads are thus covei'ed from wall to wall in eachdirection, as best seen in Figs. l and 2.

After the floor has been partially covered f in the manner abovedescribed, the additional concrete blocks 3 and chair bars Ll securelyWired thereto are positioned in all those depressed squares in line withand between the column heads. A. second layer of bands of steel mesh isnow laid in each direction, oi at right angles to each other, over thechair bars in the depressed mesh squares between the column heads, thelast laid bands being dipped or bent downward, however, only in the baysor spaces which are centrally located with respect to each set of fourcolumns, as explained above. All such bands or strips terminating inwall beams are preferably hooked or bent down, as at 9 (Fig. 2), and attheir opposite ends, if not suiiiciently long to extend from wall towall, at least lap entirely over the column heads, at which point acontinuation of such strips or bands may be started. Y

All bands lap entirely over the chair bars around column heads and arelaid directly on each other at these points. a

Around the wall section, I preferably pro- Vide short length chair bars7 wired to concrete block supports as previously described, and narrowstrips of steel mesh running parallel with the wall and depressed onlyin those spaces directly between the halfcolumn heads formed atsuchpoints, such nar row bands dipping or being bent downward into thespaces between half column heads, as in the outer floor space squares,after which additional chair bars 4t and supports therefor 3^ arepositioned thereon in the same manner as before described with referenceto the rest of the floor space, over which latter bars the mesh bandsstarting at the wall beams and running` at right angles to the wall areadapted to pass. il yAn important feature of the invention is in theprovision of short lengths of steel mesh placed over the column-headsbefore the placing of the chair bars and their supports thereabout, suchmesh running from the wall beams to a suitable point under and incontact with the steel mesh at its lowest point where it is dipped intothe squares intermediate of and in line with the. column heads. I haveindicated such short lengths of mesh with the numeral 9. By theprovision of such short lengths of mesh arranged in this way, anyunlooked for shift in tensile strains will be compensated for. lt willbe obvious suoli short lengths of mesh may be so arranged on all thecolumn heads, if desired.

The parts when arranged as above describedvare in proper position to beembedded in the concrete, which is then filled in to a depth sufficientto cover all the parts and is then smoothed off in the usual manner andallowed to set.

lt has been found in practice that a diamond mesh is suited to thepurposes of the invention, but it will be understood that any othersuitable mesh or metallic fabric may be used, The mesh may be properlydipped or bent downward into Ithose squares where required by any wellknown. means, such, for instance, as a heavy tamping tool.

It will be understood that l do not confine myself to the exactarrangements of parts herein described, as it will be obvious thatvarious modifications of the arrangement may be made and still be withinthe scope of the invention as defined by the claims.

l. A. flat slab floor construction, comprisn ing a series of columnsarranged in rows.l adjacent columns .forming bays therebetween and a baycentral of each set of four columns, bands of metallic reenforoing meshof a width substantially equal to said bays laid at right angles to eachother and eir-y tending over the column heads and the bays between andin line with said column heads, said bands being` depressed in suchbays, and superposed bands of metallic mesh of a width substantiallyequal to the bays laid at right angles to each other and the first laidbands and extending over the bays which are central of each set of fourcolumns.

' 2. A. flat slab floor construction, compris :ing a series of columnsarranged in rows, adjacent columns forming bays, chair bars and supportstherefor arranged around .the column heads, bands of metal reenforcingmesh extending from column head -to column head positioned on said chairbars, said bands being depressed in the bays between adjacent columnheads, chair bars and supports therefor positioned onsaid depressed meshsections forming central Abays, and superposed bands of metallic rmeshlaid at right angles to each other and supported by the last mentionedchair bars, said latter lbands extending `over the bays central of eachset of four columns and being depressed only in such central bays.

3. A flat slab' floor construction, comprising a series of columnsarranged rows, adjacent columns yforming bays, chair bars and supports'therefor arranged about the column heads, bands of steel mesh positionedon said chair bars and extending over and being depressed in the baysbetween adjacent colunm heads, chair bars and sup ports thereforpositioned 4on top of such mesh in the depressed sections formingcentral bays, and superposed bands of steel mesh laid at right angles toeach other over said last mentioned chair bars and covering the bayscentral of each set of four eolumns, said latter bands being depressedand in contact in such central bays.`

4. A flat slab floor construction, comprising a series of columnsarranged in rows, adjacent collumns forming bays, enlargements formed onsaid column heads, Chair bars and supports therefor arranged about saidcolumn head enlargements, metallic mesh bands positioned on said chairbars and extending over and covering the bays between adjacent columnheads and being depressed in such bays, chair bars and supports thereforlocated on top of the mesh bands in 4such depressed sections formingcentral bays, and superposed bands of metallic mesh arranged at rightangles to each other and extending over the bays central of each set offour columns, said latter bands being depressed and in contact only insaid central bays,

In testimony whereof,I have hereunto set my hand.

JOSEPH DI STASIO.

